Carrier-cushion for sandpapering-machines



A. E. MOON. CAR-BIER CUSHION FORSANDPAPERING MACHINES.

Patented Mar. 8,1921.

APPLICATION FILED SEPT9| 1918.

UNITED STATES PATENT OFFICE.

ALFRED E. MOON, OF AKRON, OHIO, ASSIGNOR TO THE B. F. GOODRICH COMPANY,OF NEW YORK, N. Y., A CORPORATION 0F NEW YORK.

CARRIER-CUSHION FOR SANDPAPERING-MACHINES.

Specification of Letters Patent.

Patented Mar. 8, 1921.

Applcatonled September 9, 1918. Serial No. 253,127.

To all whom it may concern Be it known that I, ALFRED E. MooN, a citizenof the United States, residing at Akron, in the county of Summit andState of Ohio have invented a certain new and useful Oarrier-Oushion forSa-ndpapering- Machines, of which the following is a specification.

This invention relates to machines for sandpapering lumber and similarwork, and relates more particularly to the construction of thesupporting and driving cushions forming a part of the endless carrierwhereby the work is presented to the action of the sanding drums. yprincipal obJect is to provide a. cushion of greater durability and moresecure anchorage than those heretofore employed.

Of the accompanying drawings,

Figure 1 is a longitudinal section illustrating the principal workingparts of a sandpapering machine.

Fig. 2 is a section through one of the elements of the carrier taken ona line transverse to the line of movement of the latter and illustratingtwo of my improved cushion pads.

Fig. 3 is a perspective view of one of the cushion pads.

Fig. 4 is a top plan view thereof partly broken away.

In the drawings, 10, 10 are the abrasive drums of a familiar type ofsandpapering machines, and 11 is the dusting or brush roller locatedposterior to the series of drums. 12 is the usual endless conveyer orcarrier composed of slats or sections l'mounted ou a chain 14 whichpasses around sprockets on a pair of shafts 15, the bearing frame 1G ofthe carrier being vertically adjustable toward and from the sandingdrums.

Each section 13 comprises a foundation plate 17 and a cushion-retainingplate 1S detachably secured thereto and provided with undercut holes orperforations 19 whose sides define the sockets in which are mounted thebases of the cushion pads 20. These pads are composed mainly of softvulcanized rubber and they collectively form a frictional cushionsurface for propelling the work and yieldingly supporting the same whilesubjected to the action of the sanding drums 10.

Owing to the severe strains to which the cushion `pads are subjected, itis a difficult matter to-anchor them upon the carrier sections in suchmanner as to provide the maximum desired propelling and cushioningeffect and at the same time avoid the liability of said pads to tearapart or pull out of their retaining sockets. My present inventionprovides a construction which has proved very satisfactory in use andwhich consists, as here shown, in incorporating in the base of eachcushion pad a number of layers of rubberized fabric, such as ordinaryfriction fabric, 'securely vulcanized together and to the main rubberbody of the pad and forming a reinforcement 21. It is found that thisconstruction gives just the necessary amount of stiffness to the base,combined with a certain degree of flexibility. and a permanent unionbetween the reinforcement and the body. The active part of the cushionpad is a lozenge-shaped boss Vor memberl 22 whose sides are parallelwhen viewed edgewise of the pad as in Fig. 2, and a taper-edged conoidalbase 23 which occupies the retaining socket and spreads or flaresoutwardly and downwardly from said member. I have found it desirable tomake the fabric reinforcement 21 of a thickness somewhat less than theheight of the base 23 and occupying the lower part thereof, thesoft-rubber body extending into and forming the upper part of said base,this arrangement affording the best cohesion and distribution ofstra-ins.

I claim:

1. In an endless carrier for sand-papering machines, a carrier sectioncomprising a foundation plate, a retaining plate having under-cutapertures therein, and a series of soft-topped rubber cushion padsraving flared bases provided with multi-ply fabric reinforcements,substantially coextensive with said bases laterally thereof, and clampedagainst the :foundation plate by the overlying sides of said apertures.

2. A cushion pad for endless carriers, said pad being ofhorizontally-elongated forinand provided with a soft-rubber top portion,and a conoidal fiared base portion reinforced with plural plies offabric forming a substantial part of the thickness of the base andsubstantially coextensive with said base, laterally thereof. Y

In testimony whereof I have hereunto set my hand this 28 day of August,1918.

ALFRED E. MOON.

